Function miracl32::hmac::GPhashit

pub fn GPhashit(
    hash: usize, 
    sha: usize, 
    w: &mut [u8], 
    pad: usize, 
    zpad: usize, 
    a: Option<&[u8]>, 
    n: isize, 
    b: Option<&[u8]>
)